Question 236956
Let  L=  skid  length  in  ft,,,,v= veolcity  in  MPH
.
L=kv^2
.
subst  data  given,,,,,172 = k (60)^2,,,,,,,k=  172/60^2 = .0477
.
proportion  becomes,,,L= .0477 v^2
.
for  v=50,,,,,L = .0477 * 50^2 = 119.44  ft
.
.
checking,,,, 119.44/50^2 = .0477,,,,ok